Problem
Animal welfare is about the physical and mental wellbeing of animals. It covers a wide range of issues, such as wildlife trade, exploitation in research, animal farming or the use of animals for entertainment [1-4]. Welfare standards, when it comes to the treatment of animals, vary depending on geography and context and are highly debated amongst animal welfare groups, academics and legislative bodies [5,6]. Although most agree that animals should be treated humanely, global animal treatment monitoring is a complex issue. Disturbing reports of the cruel treatment of animals are still frequent.